1, the onset of symptoms: eggplant nitrogen deficiency: small and thin leaves, lower leaves light green, severe nitrogen deficiency when the yellow and easy to fall off, small fruit, prone to deformity. The lack of phosphorus in eggplant: the leaves are small, the surface gloss is dark, the color is dark, and the fruit does not last long. After entering the late stage of growth and development, the lower leaves are susceptible to aging. The lack of potassium in the eggplant: yellow leaves on the lower leaves, light green to yellow spots between veins with severe potassium deficiency. The lack of calcium in eggplant: the top of the upper leaves is blocked and the veins turn yellow-brown between veins. Calcium deficiency prone to top rot. Magnesium deficiency in eggplant: leaf yellowing occurs near the midrib of the lower leaf blade, and brown necrotic spots appear between veins when magnesium deficiency is severe. Iron deficiency in eggplant: occurs mostly at the top of the plant, yellowing occurs at the top leaves, and this yellowing is more uniform. The lack of boron in the eggplant: hard stems and leaves, severe yellowing of the parietal lobe, buds bent, stop growing. The lack of manganese in eggplant: Symptoms appear on the upper middle leaves, and there are no obvious yellow and brown spots between the veins, and the leaves easily fall off.
2. Prevention and control methods: (1) Prevent nitrogen deficiency: Before planting, apply sufficient amount of manure or chicken manure 5500kg. In the case of eggplant, timely fertilizer in the case of eggplant enlargement. (2) To prevent phosphorus deficiency: Apply 667 square meters of organic fertilizer before planting eggplant. Apply phosphate fertilizer 25-35kg. (3) To prevent potassium deficiency: Apply 15-25 kg of potassium sulfate to the base fertilizer and evenly remove it on the surface of the soil to evenly plow the layer. (4) Preventing iron deficiency: Adjusting the acid soil to neutrality, magnesium hydroxide or lime can be applied to gradually adjust and improve the conditions of multiple fertilizers and humid conditions. When the soil is too wet, watering is reduced and the water is drained immediately after the rain. (5) Prevent magnesium deficiency: Pay attention to the improvement of acidic or alkaline soil to neutral, increase organic fertilizer and pay attention to nitrogen, phosphorus and potassium. (6) To prevent manganese deficiency: Apply proper amount of manganese oxide or manganese sulfate to the base fertilizer.
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